diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 1 | ||||
| -rw-r--r-- | lib/stackdepot.c | 67 |
2 files changed, 46 insertions, 22 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 075cd25363ac..78d6139111cd 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -709,6 +709,7 @@ config DEBUG_SLAB config SLUB_DEBUG_ON bool "SLUB debugging on by default" depends on SLUB && SLUB_DEBUG + select STACKDEPOT_ALWAYS_INIT if STACKTRACE_SUPPORT default n help Boot with debugging on by default. SLUB boots by default with diff --git a/lib/stackdepot.c b/lib/stackdepot.c index bf5ba9af0500..5ca0d086ef4a 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -66,6 +66,9 @@ struct stack_record { unsigned long entries[]; /* Variable-sized array of entries. */ }; +static bool __stack_depot_want_early_init __initdata = IS_ENABLED(CONFIG_STACKDEPOT_ALWAYS_INIT); +static bool __stack_depot_early_init_passed __initdata; + static void *stack_slabs[STACK_ALLOC_MAX_SLABS]; static int depot_index; @@ -162,38 +165,58 @@ static int __init is_stack_depot_disabled(char *str) } early_param("stack_depot_disable", is_stack_depot_disabled); -/* - * __ref because of memblock_alloc(), which will not be actually called after - * the __init code is gone, because at that point slab_is_available() is true - */ -__ref int stack_depot_init(void) +void __init stack_depot_want_early_init(void) +{ + /* Too late to request early init now */ + WARN_ON(__stack_depot_early_init_passed); + + __stack_depot_want_early_init = true; +} + +int __init stack_depot_early_init(void) +{ + size_t size; + + /* This is supposed to be called only once, from mm_init() */ + if (WARN_ON(__stack_depot_early_init_passed)) + return 0; + + __stack_depot_early_init_passed = true; + + if (!__stack_depot_want_early_init || stack_depot_disable) + return 0; + + size = (STACK_HASH_SIZE * sizeof(struct stack_record *)); + pr_info("Stack Depot early init allocating hash table with memblock_alloc, %zu bytes\n", + size); + stack_table = memblock_alloc(size, SMP_CACHE_BYTES); + + if (!stack_table) { + pr_err("Stack Depot hash table allocation failed, disabling\n"); + stack_depot_disable = true; + return -ENOMEM; + } + + return 0; +} + +int stack_depot_init(void) { static DEFINE_MUTEX(stack_depot_init_mutex); + int ret = 0; mutex_lock(&stack_depot_init_mutex); if (!stack_depot_disable && !stack_table) { - size_t size = (STACK_HASH_SIZE * sizeof(struct stack_record *)); - int i; - - if (slab_is_available()) { - pr_info("Stack Depot allocating hash table with kvmalloc\n"); - stack_table = kvmalloc(size, GFP_KERNEL); - } else { - pr_info("Stack Depot allocating hash table with memblock_alloc\n"); - stack_table = memblock_alloc(size, SMP_CACHE_BYTES); - } - if (stack_table) { - for (i = 0; i < STACK_HASH_SIZE; i++) - stack_table[i] = NULL; - } else { + pr_info("Stack Depot allocating hash table with kvcalloc\n"); + stack_table = kvcalloc(STACK_HASH_SIZE, sizeof(struct stack_record *), GFP_KERNEL); + if (!stack_table) { pr_err("Stack Depot hash table allocation failed, disabling\n"); stack_depot_disable = true; - mutex_unlock(&stack_depot_init_mutex); - return -ENOMEM; + ret = -ENOMEM; } } mutex_unlock(&stack_depot_init_mutex); - return 0; + return ret; } EXPORT_SYMBOL_GPL(stack_depot_init); |